I don't plan on using it in my RC engines, but I have 2 riding lawn mowers that I put it in that have been ridden hard and put up wet for years that should have been dead a long time ago. Both still have excellent compression and don't show any signs of giving up soon nor oil consumption. I think that a lot of recommendations are always centered around liability and that they don't want to open that can of worms. I wouldn't use it in a vehicle that is safety related, but I sure would have like to seen what would have happened if I had put it in my wifes car that locked up the engine because the mechanic did not tighten the oil cooler line, which I could not prove resulting in a $4000 fix.